JP2020029317A - Belt cleaner - Google Patents

Abstract

To solve the problem, when lifting a thin plate with a plurality of height adjustment bolts to adjust a height of a square rod-shaped rubber elastic body, of difficulty in accurately bringing the square rod-shaped rubber elastic body being displaced from the height adjustment bolts into contact with a return belt, and of occurrence of a streak-shaped unscraped portion due to a gap formed at a free side end of an adjacent square rod-shaped rubber elastic body, because of the return belt having a convex arc shape on the upper side, but a height and a shape of a camber being different for each belt.SOLUTION: A plurality of the height adjustment bolts are rotatably mounted on a bottom plate of a pedestal where the square rod-shaped rubber elastic bodies are arranged, and a thin plate is laid on the bottom plate and a height adjustment material is fitted on the thin plate, which make it possible for all the square rod-shaped rubber elastic bodies to be accurately brought into contact with both the convex arc shape and small unevenness of the return belt. In addition, the free side ends of the square rod-shaped rubber elastic bodies are connected by a connecting bodies to prevent gap generation, thereby the problem of a streak-shaped unscraped portion is solved.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a belt cleaner for scraping off deposits on a return belt of a belt conveyor.

The conveyed material of the belt conveyer is conveyed by the conveyer side belt, discharged on the driving pulley side, returns to the return side belt, and returns to the driven pulley, but the adhering matter adhering to the return side belt surface falls down and accumulates, so It was necessary to periodically remove the sediment.

Normally, a scraper-type belt cleaner dedicated to scraping off extraneous substances is installed around the drive pulley of the return belt, but it is difficult to precisely contact the scraper with the return belt, and the scraping performance is poor. Was enough. If the scraper is pressed too much against the return belt, there is a problem that the return belt is damaged.

The belt cleaner is indispensable for scraping off the deposits on the belt surface. However, if an appropriate pressing force is not constantly maintained, the scraping performance will be reduced and the belt will be damaged, resulting in a production hindrance. There are many issues that a belt cleaner has to clear and it is difficult to address all the issues. Until now, belt cleaners of various shapes and functions have been proposed, but no maintenance-free belt cleaner with excellent scraping efficiency has been realized.

The requirements for a scraper type belt cleaner are as follows. (1) When the belt cleaner is mounted on the actual machine, the scraping portion can be brought into contact with the convex arc-shaped shape of the return-side belt and can also accurately contact small irregularities in the belt width direction. (2) The chip is largely bent in the running direction of the return belt in response to the strong adhesion of the return belt and peeling of the endless portion (connection portion), and the obstacle is instantaneously passed to avoid damage to the belt cleaner. At the same time, a normal scraping state can be instantaneously returned. (3) It is possible to reliably scrape off the deposits for a long time. (4) The tip has a long life and can be easily replaced. (5) The adjustment cycle and replacement cycle of the belt cleaner are long, and adjustment and installation / removal are easy. Conventionally, various belt cleaners have been proposed to satisfy the above characteristics, but a satisfactory method has not been realized.

Japanese Patent Application Laid-Open No. 2013-252976 discloses a cleaner in which a rectangular rod-shaped rubber elastic body divided into small widths and having a tip attached to a tip is fixed by a holding plate and arranged in a groove. In this method, since there is no height adjusting mechanism, it is difficult to make the rectangular rod-shaped rubber elastic chip abut on the convex arc-shaped return belt surface.

In Japanese Patent Application Laid-Open No. 2015-036327, in order to prevent the rectangular rod-shaped rubber elastic body from falling in the thrust direction, a through hole is provided in a fixing portion of a chip stick (rectangular rod-shaped rubber elastic body) to form a square rod-shaped rubber. A method has been proposed in which a rubber elastic body is passed through a horizontal skewer and integrated. In this method, since it is restrained by the horizontal skewer, it is difficult to match the square rod-shaped rubber elastic body to the convex arc shape of the return belt.

Japanese Patent Application Laid-Open Publication No. 2006-216184 proposes a method of raising a thin plate with a height adjusting bolt to raise a rectangular rod-shaped rubber elastic body. In this method, the rectangular rubber elastic body can be substantially brought into contact with the convex arc of the return belt, but the rectangular rubber elastic body between the height adjustment bolts has small unevenness of the return belt. Could not be contacted precisely. In addition, a gap is formed at the free side end of the adjacent rubber elastic body made of a square rod due to the fan-shaped spread at the time of height adjustment and the thrust force of the return side belt, so that scraping remains.

In Japanese Patent Application No. 2017-164011 public information (registration number 6355181), a height-adjusting material having compressibility is laid in a groove of a gantry, and a rubber elastic body having a square rod shape is placed thereon, and the height of the gantry is raised by raising the gantry. There has been proposed a method of compressing an adjusting material and abutting a square rod-shaped rubber elastic body on a return belt. In this method, when the return side belt has a convex arc shape, the arrow height is 30 to 40 mm. In order to cope with the arrow height, it is necessary to increase the height of the height adjusting material, If the depth is not deep, the holding of the square rod-shaped rubber elastic body becomes unstable, and it is difficult to vertically move up and down.

JP 2013-252976 PR JP-A-2005-036327 JP-A No. 2006-216184 Japanese Patent Application No. 2017-164011

The present invention solves the following problems. (1) The height of the rectangular rod-shaped rubber elastic body, which is the scraping portion of the belt cleaner, is adjusted to the convex arc shape of the return side belt, and at the same time, it can accurately contact small irregularities. (2) When the rubber elastic body in the shape of a square rod is largely bent by the protrusion of the return belt, it can be properly returned to the normal scraping position. (3) Receiving the thrust force of the return-side belt, the tip of the adjacent rubber elastic body made of a square rod is prevented from opening to form a gap.

According to a first solution, a plurality of square rod-shaped rubber elastic bodies are arranged in a groove of a gantry arranged in a width direction of a return side belt, and a bottom plate of the groove has: In a belt cleaner in which a plurality of height adjusting bolts are rotatably attached and a flexible thin plate is laid on the bottom plate, a compressible high height is provided between the thin plate and the rubber elastic body having a square rod shape. When the thin plate is pushed up by the height adjusting bolt, the rectangular rubber elastic body is raised, and after contacting the return belt, the thin plate is further raised. The belt cleaner is characterized in that the height adjusting member is compressed by pressing, and all the square rod-shaped rubber elastic members are brought into contact with the return side belt.

As a second solution, as set forth in claim 2, the height adjusting member is a block-shaped sponge, and the block-shaped sponge is joined to a lower end of each of the rectangular rod-shaped rubber elastic bodies. 2. The belt cleaner according to claim 1, wherein said belt cleaner is integrated with said square rod-shaped rubber elastic body.

According to a third aspect of the present invention, the height adjusting member is a compression spring, and is inserted into a short axis attached to the end face of each of the rectangular rod-shaped rubber elastic bodies in the axial direction. A belt cleaner characterized by being integrated with the quadratic rod-shaped rubber elastic body.

According to a fourth aspect of the present invention, a through hole is provided in an upper end of the rubber elastic body having a rectangular rod shape in a width direction of the return belt, and the through hole has flexibility. 4. The connecting body is penetrated, and the quadrangular rubber elastic body is connected by the connecting body, and both ends of the connecting body are fixed by short pipes. Or a belt cleaner according to claim 4.

The effects of the first solution are as follows. (1) In the first step, the thin plate is bent by pushing up the height adjusting bolt, and the square rod-shaped rubber elastic body and the height adjusting material are brought into approximate contact with the convex arc shape of the return side belt. Further, in the second step, when the height adjusting bolt is pushed up, the height adjusting material is compressed, so that all the square rod-shaped rubber elastic bodies can be accurately brought into contact with the small unevenness of the return belt. . (2) The rough contact in the first step and the precise contact in the second step are continuous operations, and all the square rod-shaped rubber can be brought into contact with the return belt simply by pushing up the height adjustment bolt. (2) After adjusting the height of the square rod-shaped rubber elastic body, if the pressing plate is pressed against the square rod-shaped rubber elastic body, the square rod-shaped rubber elastic body is fixed in the groove, and the square rod-shaped rubber elastic body comes out. And pushing can be prevented.

The effects of the second solution are as follows. (1) Since the square rod-shaped rubber elastic body and the block-shaped sponge are integrated and can move independently, the square rod-shaped rubber elastic body and the return belt can abut precisely. (2) Since the sponge is independent, a large amount of compression can be obtained with a small force.

The effects of the third solution are as follows. (1) Since the square rod-shaped rubber elastic body and the compression spring are integrated and can move independently, the square rod-shaped rubber elastic body and the return belt can abut precisely. (2) Since the compression springs are independent, a large amount of compression can be obtained with a small force.

The effects of the fourth solution are as follows. (1) Since the connecting body communicates with the communication hole provided on the upper part of the square rod-shaped rubber elastic body, even if a strong adhered substance collides, the square rod-shaped rubber elastic body is adjacent to the square rod-shaped rubber elastic body. Since it bends together with the elastic body, it can be instantaneously returned to the original position without extremely bending. (2) Since the connecting body can bend with a large curvature, when the thin plate is pushed up with the height adjusting bolt, the rectangular rod-shaped rubber elastic body forms an arc with a large curvature, and hits the convex side return belt. I can contact you. (3) Since both ends of the connected body are fixed to the square rod-shaped rubber elastic bodies at both ends with short pipes, and no gap is generated between adjacent square rod-shaped rubber elastic bodies even when subjected to a thrust force, No streaks are left. (4) At the time of height adjustment, it is possible to prevent the free-side end of the square rod-shaped rubber elastic body from opening in a fan shape.

Is a perspective view of a belt cleaner partially sectioned. FIG. 4 is a front sectional view before adjustment of a belt cleaner using a compression spring as a height adjusting member. 7 is a front sectional view after adjustment of a belt cleaner using a compression spring as a height adjusting member. 7 is a front sectional view of a belt cleaner using a sponge as a height adjusting member before adjustment. 7 is a front sectional view after adjustment of a belt cleaner using a sponge as a height adjusting member. FIG. 4 is a positional relationship diagram of a partially worn return side belt and a square rod-shaped rubber elastic body. FIG. 4 is a positional relationship diagram of a rectangular rod-shaped rubber elastic body abutting on a partially worn portion of the return belt. FIG. 3 is a partial cross-sectional perspective view of a belt cleaner on which a sponge is laid. FIG. 4 is a cross-sectional view of a square rod-shaped rubber elastic body integrated with a compression spring. 1 is a cross-sectional perspective view of a rectangular rod-shaped rubber elastic body integrated with a block-shaped sponge. Is a partial cross-sectional front view of the belt cleaner that has become wider due to the absence of a connecting body. Is a front view of a belt cleaner provided with a connecting body.

An embodiment of the present invention will be described based on claims 1 to 5 and FIGS.

As a first solution, a plurality of square rod-shaped rubber elastic bodies 20 are arranged in a groove 40a of a gantry 40 arranged in the width direction of the return belt 30 as described in claim 1, A plurality of height adjusting bolts 50 are rotatably mounted on the bottom plate 43 of the base plate 40a, and the belt cleaner 10 in which a flexible thin plate 60 is laid on the bottom plate 43, the thin plate 10 and the elastic rubber rubber. A compressible height adjusting member 70 is fitted between the bodies 20, and when the thin plate 60 is pushed up by the height adjusting bolt 50, the square rod-shaped rubber elastic body 20 is raised, After the contact with the return belt 30, the thin plate 60 is further raised to compress the height adjusting member 70, and all the square rod-shaped rubber elastic bodies 20 contact the return belt 30. Contact A belt cleaner 10, characterized in that it is.

As the height adjusting member 70, a sponge 71 or a compression spring 72 can be used.

FIG. 1 is a partial cross-sectional perspective view of a belt cleaner 10 in which a compression spring 72 is fitted as a height adjusting member 70 between a thin plate 60 and a rectangular rod-shaped rubber elastic body 20. The gantry 40 includes a front side plate 41, a rear side plate 42, a bottom plate 43, a holding plate 44, a holding bolt 45, a flange 46, and a support pipe 47. The support pipe 47 is supported by a support pipe receiver 48, and the support pipe receiver 48 is mounted on a conveyor base. The square rod-shaped rubber elastic bodies 20 are arranged in a groove 40 a formed by the front plate 41, the rear plate 42, and the bottom plate 43. The rear side plate 42 is provided with a threaded through hole 42a, and a holding bolt 45 is rotatably attached. The rubber elastic body 20 having a square rod shape is pressed and pressed by the holding bolt 45, and is sandwiched and fixed between the holding plate 44 and the front side plate 41. The bottom plate 43 is provided with a threaded through-hole 43a, and a height adjusting bolt 50 is rotatably mounted.

In the first step, when the height adjusting bolt 50 is raised, the thin plate 60 is raised, and the height adjusting member 70 and the rectangular rod-shaped rubber elastic body 20 are raised, and the rectangular rod-shaped rubber elastic member around the height adjusting bolt 50 is raised. The body 20 substantially abuts on the convex arc shape of the return belt 30. As the second step, when the height adjusting bolt 50 is further raised, the height adjusting material 70 is gradually compressed, and all the square rod-shaped rubber elastic bodies 20 sequentially and precisely contact the return side belt 30. . As described above, in the present invention, the approximate height adjustment is performed in the first step, and the height adjustment bolt 50 is continuously raised in the second step. The square rod-shaped rubber elastic body 20 can be accurately brought into contact with the return belt 30.

The square rod-shaped rubber elastic body 20 needs a pressing force for pressing the free side terminal 20a against the return side belt 30 and also needs to flexibly follow fine irregularities of the return side belt 30. Therefore, rubber is used for the square rod-shaped rubber elastic body 20. As the rubber, for example, natural rubber, synthetic natural rubber, styrene, butadiene rubber, chloroprene rubber, acrylic rubber, nitrile rubber, urethane rubber, fluorine rubber and the like can be used.

The cross section of the square rod-shaped rubber elastic body 20 is a square as shown in FIG. It is desirable that the width S and the thickness B of the rectangular rod-shaped rubber elastic body 20 are substantially the same. In addition, the area around the free-side end 20a of the square rod-shaped rubber elastic body can be made thinner than the fixed side because the acting moment is small. When the width S and the thickness B of the square rod-shaped rubber elastic body 20 are the same, it is preferable that S = B = 10 to 30 mm. If it is 10 mm or less, the rigidity is weak and the scraping ability is reduced. If it is larger than 30 mm, the rigidity is too large, the deflection becomes small, and the small unevenness of the return belt 30 cannot be flexibly followed. The length L of the square rod-shaped rubber elastic body 20 is preferably 50 to 300 mm. The length L is a length protruding from the holding plate 44. If it is shorter than 50 mm, the deflection is too small, and the followability to the return belt 31 is reduced. If it is longer than 300 mm, the amount of deflection is too large and the scraping force is reduced. In order to increase the elastic force of the square rod-shaped rubber elastic body 20, the thickness B is preferably slightly larger than the width S.

As the material of the thin plate 60, a resin thin plate such as urethane, fluorine, rubber, and plastic, a metal thin plate such as SUS, copper, titanium, and carbon steel, and carbon fiber can be used. It is required to be flexible enough to flex flexibly when pushed up by the height adjustment bolt 50, and to have a strength capable of pushing up a plurality of square rod-shaped rubber elastic bodies 20 at the same time.

The thickness of the thin plate 60 is preferably 2 to 6 mm in the case of the resin thin plate 60. If it is 2 mm or less, it is impossible to push up a plurality of square rod-shaped rubber elastic bodies 20. On the other hand, if it is 6 mm or more, the return belt 30 cannot be formed to have a convex arc-shaped curvature. In the case of the thin metal plate 60, 1 to 3 mm is preferable. If it is 1 mm or less, it is impossible to push up a plurality of square rod-shaped rubber elastic bodies 20. If it is 3 mm or more, the return belt 30 cannot be formed to have a convex arc-shaped curvature.

As shown in FIG. 8, a tip 90 made of an abrasion-resistant material may be attached to the free end 20a of the square rod-shaped rubber elastic body. The material of the tip 90 can be ceramics, cemented carbide or cermet.

FIG. 9A is a cross-sectional view in which a square rod-shaped rubber elastic body 20 to which a compression spring 72 is attached as a height adjusting member is attached to a groove 40 a of the gantry 40. FIG. 9B is a side view of the square rod-shaped rubber elastic body 20 in which the short axis 721 is attached to the end face 20 c of the square rod-shaped rubber elastic body 20 and the compression spring 72 is attached to the short axis 721.

In order to form the compression spring 72 and the square rod-shaped rubber elastic body 20 integrally, the short axis 721 is inserted into the end face 20c of the square rod-shaped rubber elastic body 20, and the compression spring 72 is inserted into the short axis 721 and fixed. . The short shaft 721 may be screwed into the square rod-shaped rubber elastic body 20 or may be fixed with an adhesive. The material of the short shaft 721 can be metal, resin, or rubber. The outer shape of the short shaft 721 is set to be 0.1 to 0.2 mm larger than the inner diameter of the compression spring 72 so that the square rod-shaped rubber elastic body 20 does not come off from the short shaft 721. When the compression spring 72 is pushed into the short shaft 721, the inner diameter of the compression spring 72 expands elastically, and the short shaft 721 and the compression spring 72 are integrated by tightening the short shaft 721.

As the material of the compression spring 72, a metal wire such as a hard wire for a compression spring, a piano wire, a stainless steel wire, or a resin wire such as polycarbonate, polyacetal, and peak (polyetheretherketone) can be used. The unevenness on the surface of the return belt is 5 to 10 mm. Therefore, the amount of expansion and contraction of the compression spring 72 may be 5 to 15 mm. The elastic constant of the compression 72 is preferably 0.5 to 2.0 N / mm. If it is smaller than 0.5 N / mm, it is restricted by the frictional force between the adjacent rectangular rod-shaped rubber elastic bodies 20 and cannot perform a proper ascending movement. If it is larger than 2.0 N / mm, a large force is required when pushing up with the height adjusting bolt 50, and there is a problem that the thin plate 60 is partially plastically deformed.

When the height adjusting member is a sponge, as shown in FIG. 8, one string-shaped sponge 71 or a sponge divided into a plurality of pieces can be used. As shown in FIG. 10, a block-shaped sponge 71 may be joined to each of the rectangular rod-shaped rubber elastic bodies 20. FIG. 10A is a cross-sectional view in which the square rod-shaped rubber elastic body 20 to which the sponge 71 is attached as the height adjusting member 70 is attached to the groove 40 a of the gantry 40. FIG. 10B shows an example in which a sponge 71 of a prismatic block is attached to the end face 20 c of each of the rectangular rod-shaped rubber elastic bodies 20. FIG. 10C shows an example in which a sponge 71 of a cylindrical block is attached to the end surface 20 c of each of the rectangular rod-shaped rubber elastic bodies 20. The sponge 71 can be bonded to the end face 20c of the square rod-shaped rubber elastic body 20 with an adhesive. When the sponge 71 is individually attached to each of the square rod-shaped rubber elastic bodies 20, the position adjustment can be performed accurately because the sponge 71 is not affected by the adjacent square rod-shaped rubber elastic bodies 20.

The sponge 71 is a porous soft substance having a myriad of fine holes inside, and is made by foaming a synthetic resin such as polyurethane. The expansion and contraction amount of the sponge 71 is preferably 5 to 15 mm, and the elastic constant is preferably 0.5 to 2.0 N / mm.

As shown in FIG. 11, when the thin plate 60 is raised with the height adjusting bolt 50 in accordance with the convex arc shape of the return side belt 30, the free side terminal 20a of the square rod-shaped rubber elastic body 20 opens in a fan shape, and A gap δ is generated between the fitted square rod-shaped rubber elastic bodies 20.

As shown in FIG. 12, the alternating load in the thrust direction is repeatedly received from the return belt 30, so that the square rod-shaped rubber elastic body 20 has an inclination θ. For this reason, a gap δ is generated between the adjacent rectangular rod-shaped rubber elastic bodies 20. Such a gap δ causes a streak-like scraping residue.

As shown in FIGS. 2, 3, 4, and 5, a connecting body 80 is provided at the free end 20a of the square rod-shaped rubber elastic body 20 to connect the square rod-shaped rubber elastic body 20 so that the gap δ does not occur. Is good. Both ends of the connector 80 can be passed through, for example, a short tube 81 made of metal, and the short tube 81 can be crushed and fixed. Japanese Patent Application Laid-Open No. 2015-036327 discloses a method of connecting the lower part of a square rod-shaped rubber elastic body with a horizontal skewer, but connecting the free side terminal 20a more effectively prevents the gap δ than connecting the lower part. The effect of doing is greater.

The connecting body 80 uses a flexible wire. As the wire, a metal rod or wire of stainless steel, copper, titanium, carbon steel, or the like, or a wire obtained by twisting these fine wires can be used. Also, a rod made of a resin such as urethane resin, fluorine resin, nylon resin, or the like, or a wire formed by twisting these fine wires can be used. The diameter of the wire 80 is 1 to 4 mm. If it is 1 mm or less, the strength of the wire 50 is insufficient, and there is a risk that the wire 50 is cut by the thrust force or the horizontal force of the return side belt 30. If it is larger than 4 mm, the flexibility of the wire 50 is reduced, and the rectangular rubber elastic body cannot flexibly follow the upward convex arc shape of the return side belt 30 or small unevenness in the width direction. Desirably, it is 2-3 mm.

FIG. 2 is a front sectional view of the belt cleaner 10 before adjustment using the compression spring 72 as the height adjusting member 70. Normally, the return side belt 30 has a convex arc shape due to the trough habit of the carrier roller as it moves downstream from the drive roller. The height difference H between the lowermost end A and the uppermost end B of the convex arc is 5 to 40 mm. H corresponds to the arrow height in the relationship between the chord and the arc.

As shown in FIG. 2, an example of height adjustment when a compression spring 72 is used as the height adjustment member 70 will be described. The gantry 40 of the belt cleaner 10 is raised to bring the square rod-shaped rubber elastic body 20 into contact with the lowest point A. At this point, only the lowest point A and a part of the rectangular rod-shaped rubber elastic body 20 are in contact with each other, and a height difference of H from the highest point B occurs. As shown in FIG. 3, when the height adjusting bolt 50 is raised to bring the square rod-shaped rubber elastic body 20 into contact with the uppermost point B of the convex arc shape of the return belt 30, as shown in FIG. 6, In the conventional belt cleaner 10, the square rod-shaped rubber elastic body U and the square rod-shaped rubber elastic body Z that first contact the return side belt 30 serve as stoppers, and the square rod-shaped rubber elastic bodies V to Y can be further raised. As a result, a gap h 1 was formed between the return belts 30, and this portion was left unscrewed.

In the present invention, as shown in FIG. 7A, after the rectangular rubber elastic members U and Z abut on the return belt 30, the compression springs 72 of the rectangular rubber elastic members U and Z are compressed. Therefore, the square rod-shaped rubber elastic bodies V to Y can rise, and each of the square rod-shaped rubber elastic bodies 20 can abut on the return side belt precisely.

An example of height adjustment when the sponge 71 is used as the height adjusting member 70 will be described with reference to FIG. The gantry 40 of the belt cleaner 10 is raised to bring the square rod-shaped rubber elastic body 20 into contact with the lowest point A. Further, when the height adjusting bolt 50 is raised to bring the rectangular rubber elastic body 20 into contact with the uppermost point B of the convex arc shape of the return side belt 30, as shown in FIG. The rubber elastic bodies V to Y cannot be lifted, and a gap h 2 occurs between the return belts.

As shown in FIG. 7 (b), after the rectangular rubber elastic members U and Z come into contact with the return belt, the sponge 71 immediately below the rectangular rubber elastic members U and Z is compressed. The square rod-shaped rubber elastic bodies V to Y can be raised, and each of the square rod-shaped rubber elastic bodies 20 can abut on the return side belt 30 precisely.

A second solution is that the height adjusting member 70 is a block-shaped sponge 71, and the block-shaped sponge 71 is attached to an end surface of each of the rectangular rod-shaped rubber elastic bodies 20. The belt cleaner 10 is characterized in that the belt cleaner 10 is joined to the rubber rod 20c and is integrated with the square rod-shaped rubber elastic body 20.

As shown in FIGS. 10 (b) and 10 (c), a block-shaped prism or cylinder-shaped sponge 71 is bonded to the end surface 20c of the rectangular rod-shaped rubber elastic body 20 with an adhesive. By integrating the sponge 71 and the square rubber elastic body 20, the lifting force of the thin plate 60 can be transmitted to each square rubber elastic body 20 alone, so that the square rubber elastic body 20 is returned. It can contact the side belt 30 precisely.

As a third solution, the height adjusting member 70 is a compression spring 72, which is a short spring attached in the axial direction of the end face 20c of each of the rectangular rod-shaped rubber elastic bodies 20. The belt cleaner 10 is inserted into the shaft 721 and is integrated with the rectangular rubber elastic body 20.

The short shaft 721 is integrally attached by inserting a compression spring into a shaft provided on the bottom surface 20c of the rubber elastic body 20 having a square rod shape. By forming the outer diameter of the short shaft 721 larger than the inner diameter of the compression spring 72, the compression spring 72 can be integrally fixed to the short shaft 721. By integrating the compression spring 72 and the square rod-shaped rubber elastic body 20, the lifting force of the thin plate 60 can be transmitted to each square rod-shaped rubber elastic body 20 alone. It can contact the return belt 30 precisely.

A fourth solution is to provide a through-hole 20b in the width direction of the return-side belt 30 at the free end 20a of the rectangular rod-shaped rubber elastic body 20, as shown in claim 4. A flexible connecting body 80 penetrates through, the square rod-shaped rubber elastic body 20 is connected by the connecting body 80, and both ends of the connecting body 80 are fixed by short pipes 81. The belt cleaner 10.

As shown in FIGS. 2, 3, 4, and 5, a connecting body 80 is provided at the free end 20 a of the square rod-shaped rubber elastic body 20, and connects the square rod-shaped rubber elastic body 20. Both ends of the connector 80 can be passed through, for example, a short tube 81 to crush and fix the short tube 81.

The free end 20a of the square rod-shaped rubber elastic body 20 receives the alternating load of the return belt 30 in the thrust direction, and a gap δ is generated. In addition, the thin plate 60 is bent in an arc shape by the height adjustment bolt 50, so that the free side terminal 20a opens in a fan shape and a gap δ is generated. When the gap δ occurs, the portion cannot be scraped off, so that the streak is left unscrewed. By connecting the free side terminal 20a with the connecting body 80, the fall in the thrust direction and the opening of the fan shape are restricted, and the generation of the gap δ can be suppressed. The effect of preventing the gap δ is greater when the free side terminal 20a is connected than when the lower part of the square rod-shaped rubber elastic body 20 is connected with a horizontal skewer.

The connecting body 80 uses a flexible wire. As the connecting body 80, a metal rod or a wire of stainless steel, copper, titanium, carbon steel, or the like, or a wire obtained by twisting these fine wires can be used. Also, a rod made of a resin such as urethane resin, fluorine resin, nylon resin, or the like, or a wire formed by twisting these fine wires can be used. The diameter of the connecting body 80 is 1 to 4 mm. If it is 1 mm or less, the strength of the connecting body 80 is insufficient, and there is a risk that the return side belt 30 may be cut by a thrust force or a horizontal force. If it is larger than 4 mm, the flexibility of the connecting body 80 is reduced, and the rectangular rubber elastic body 20 cannot flexibly follow the upwardly convex arc shape or the small unevenness in the width direction of the return side belt 30. Desirably, it is 2-3 mm.

10: Belt cleaner 20: Square rod-shaped rubber elastic body 20a: Free side terminal 20b (of square rod-shaped rubber elastic body) Free side terminal front face 20c (of square rod-shaped rubber elastic body) 20c: (Square rod-shaped rubber elastic body) End surface 20d: through hole 30 (of a square rod-shaped rubber elastic body): return belt 40: mount 40a: groove 41: front plate 42: rear plate 42a: threaded through hole 43: bottom plate 43a: threaded through hole. 44: holding plate 45: holding bolt 46: flange 47: supporting pipe 48: supporting pipe receiver 50: height adjusting bolt 60: thin plate 70: height adjusting material 71: sponge 72: compression spring 721, short axis 80: connecting body 81: Short tube 90: Tip 91: Screw S: Width B (of square rod-shaped rubber elastic body) B: Thickness (of square rod-shaped rubber elastic body) H: Height difference (arrow height)
h: gap δ: gap θ: tilt angle

Claims (4)

A plurality of square rod-shaped rubber elastic bodies are arranged in a groove of a pedestal arranged in the width direction of the return side belt, and a plurality of height adjustment bolts are rotatably mounted on a bottom plate of the groove, and In a belt cleaner on which a flexible thin plate is laid, a compressible height-adjusting material is fitted between the thin plate and the rectangular rubber elastic body, and the height adjusting bolt When the thin plate is pushed up, the quadrangular rod-shaped rubber elastic body rises, and after coming into contact with the return side belt, by further raising the thin plate, the height adjusting material is compressed, and A belt cleaner, wherein the quadrangular rod-shaped rubber elastic body is brought into contact with the return belt. The height adjusting member is a block-shaped sponge, and the block-shaped sponge is joined to a lower end of each of the square rod-shaped rubber elastic bodies, and is integrated with the square rod-shaped rubber elastic body. The belt cleaner according to claim 1, wherein:     The height adjusting member is a compressible spring, and the compression spring is inserted into a short axis attached to an end face of each of the rectangular rod-shaped rubber elastic bodies in the axial direction, and the rectangular rod-shaped rubber elastic body is provided. The belt cleaner according to claim 1, wherein the belt cleaner is integrated.     At the upper end of the square rod-shaped rubber elastic body, a through-hole is provided in the width direction of the return side belt, and a flexible connector is penetrated through the through-hole, and the square rod-shaped rubber elastic body is provided. The belt cleaner according to claim 1, 2, or 3, wherein the belt cleaner is connected by a connecting body, and both ends of the connecting body are fixed by short pipes.